作者在編譯extra_libs的ffmpeg部分時遇到了編譯錯誤，目前還未成功編譯（暫時擱置了）。

1 首先編譯gpac外部依賴庫

Get extra_libs source code from here. Then, goto /build/android and run the script:

./gpac_build_all_extra_libs <Android_NDK_DIR>

ps：<Android_NDK_DIR>指的是ndk的路徑

報錯1：

arm-linux-androideabi-4.9prebuiltwindows-x86_64/bin/arm-linux-androideabi-gcc is unable to create an executable file.
C compiler test failed.

If you think configure made a mistake, make sure you are using the latest
version from Git.  If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.log" produced by configure as this will help
solve the problem.

解決1:
compile_ffmpeg_android.sh中增加export TMPDIR=D:/cgywin/tmp

報錯2：

cannot open crtbegin_dynamic.o: No such file or directory
cannot open crtend_android.o: No such file or directory
error: cannot find -lc
error: cannot find -ldl

解決2：

將android-ndk-r10e\platforms\android-9\arch-arm\usr\lib下的所有文件copy到android-ndk-r10e\toolchains\arm-linux-androideabi-4.9\prebuilt\windows-x86_64\lib\gcc\arm-linux-androideabi\4.9下

如果編譯成功后將extra_libs放入gpac的extra_lib目錄下。

2 編譯gpac

執(zhí)行configure，然后make，最后應(yīng)該是在bin目錄下生成編譯好的.a。